I interviewed with nine different people over the course of one long day. (This was preceded by two separate phone interviews over the course of several days.) None of the interviews were exactly tough, in fact all were fairly pleasant. But the schedule was grueling. By the last three or four, I had a hard-time keeping straight if I was repeating myself to the person in front of me. I felt pretty good about the interviews, which they referred to as "round one." I waited a month before learning that they were not going to bring me back for the final round of four or five additional interviews.